BYG700 Advanced Fatigue Analyses (Autumn 2023)

The PhD student shall when having completed the course have thorough knowledge on the fatigue damage mechanism. The student shall know what is common practice and important research areas within the field. He or she shall be capable of carrying out advanced fatigue damage analyses and life predictions.

Contents

1. Life prediction by applying S-N curves and linear elastic fracture mechanics for modelling stable crack growth.
2. Life prediction based on FEA results. The hot spot method; challenges and limitations. Comparison with the Batelle Structural Stress (BSS) methodology for the stress definition
3. Local approaches for life predictions, discussion of weld notch geometry and associated stress concentrations. Prediction of time to crack initiation by the Coffin Manson equation.
4. Recent advances in modeling the fatigue crack propagation based on the Paris law (
5. A two-phase model for fatigue damage accumulation encompassing crack initiation and subsequent crack growth. Discussion of the slope of the S-N curves.
6. Discussion on how to account for a multiaxial stress situation
7. Statistical methods for handling scatter in important variables and final fatigue life data. Risk based inspection planning for fatigue cracks in welded steel joints